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Complete the analogy:
Food transport
Support
Photosynthesis
Gas exchange
Food transport
Remember X-W (Xylem-Water) and P-F (Phloem-Food) as a pair of vascular transport systems in plants.
Remember X-W (Xylem-Water) and P-F (Phloem-Food) as a pair of vascular transport systems in plants.
Analyze the given analogy
Xylem is a complex vascular tissue in plants responsible for the conduction of water and dissolved minerals from the roots to the stems and leaves.
Determine the functional relationship
Phloem is the other complex vascular tissue responsible for the translocation of organic nutrients (photosynthates/food), primarily sucrose, from the leaves to other parts of the plant.
Evaluate the target
Following the structure of 'Tissue: Primary Function', the blank must be the primary function of Phloem, which is food transport.
B: Support is primarily the function of sclerenchyma/collenchyma tissues. C: Photosynthesis is the metabolic process occurring in chloroplasts within leaves, not a tissue function. D: Gas exchange is primarily facilitated by stomata and lenticels.
A is correct because Phloem is biologically defined as the vascular tissue that transports food (sucrose) manufactured during photosynthesis to various plant parts.
In Biology analogies, always differentiate between the 'structure' (e.g., Xylem/Phloem) and the 'process' (e.g., Transport/Transpiration).